Was listening to the radio (R4, Today prog) the other day and apparently there are around 50 children who die in care each year in the UK, which by comparison to other countries, is not a high number.
In this case, on the advice of a specialist social worker from CAFCASS the reintroduction to the family was to be done over 2 months instead of the judge's initial decision of 4 months.
The family were very devious, and this case happened during the pandemic - so eg in one instance the family turned away a visit because the child "had covid".
Recommendations are in place for an elite team of highly skilled professionals to be deployed during difficult cases like this one.
In any case, I would hesitate to demonise social workers, who I understand to be in a poorly paid and under resourced profession.